Convertible seat



FIG. 1 is a front perspective view of a convertible seat showing my design in its folded position for use as an armchair seat and table;

FIG. 2 is a front elevational view;

FIG. 3 is a rear elevational view;

FIG. 4 is a top plan view;

FIG. 6 is a front perspective view of the convertible seat in its fully extended position for use as a combined seat and table.

The side of the convertible seat not shown in FIG. 5 is a mirror image of the side shown. 

The ornamental design for a convertible seat, as shown and described. 